GMP Audit for Excipient Suppliers: The Hidden Risk

What Excipient Supplier Audits Cover

Excipients are the inactive ingredients in a drug product. They are often assumed to be low risk, but that assumption can be wrong. Excipients can affect product performance, stability, and safety. They can also be a source of contamination.

A GMP audit for excipient suppliers assesses whether the supplier meets GMP requirements, whether materials are controlled, and whether the supply chain is secure. The scope includes qualification, testing, and supply chain controls.

The Regulatory Context

FDA 21 CFR 211 Subpart E

The FDA sets requirements for control of components, including excipients.

EU GMP Part II and Excipients

EudraLex Volume 4 Part II covers active substances. Excipients are addressed in the broader GMP framework and in specific guidance.

WHO Guidelines on Excipients

WHO has published guidance on excipients, and the 2024 to 2027 work plan includes new guidelines.

PIC/S and WHO

PIC/S Guide PE 009 and WHO GMP guidelines cover excipients.

What Audits Focus On

Qualification

Excipients should be qualified. The audit should check that qualification is documented.

Testing

Testing should be performed. The audit should check that testing is complete.

Supply Chain

Supply chain should be secure. The audit should check that suppliers are qualified.

Change Control

Changes should be controlled. The audit should check that changes are communicated.

Common Findings in Excipient Supplier Audits

Qualification Gaps

Testing Gaps

Supply Chain Gaps

Change Control Gaps

Introducing GxP Cellators for Excipient Supplier Audits

GxP Cellators provides GMP audits for excipient suppliers covering qualification, testing, supply chain, and change control.

We work across FDA, EMA, Health Canada, MHRA, WHO, and PIC/S frameworks. Our auditors bring regulatory inspection and industry quality experience, and we deliver clear, prioritized reports with practical remediation guidance.